CVE-2026-54052: CWE-639: Authorization Bypass Through User-Controlled Key in czlonkowski n8n-mcp
n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.56.1, in HTTP mode with multi-tenancy enabled through ENABLE_MULTI_TENANT=true, n8n-mcp's local workflow version history backups were not isolated per tenant, allowing an authenticated tenant to read workflow version snapshots belonging to other tenants and delete or destroy other tenants' stored backups, including full node definitions, credential references, and authorization headers. This issue is fixed in version 2.56.1.
AI Analysis
Technical Summary
The vulnerability in n8n-mcp (CVE-2026-54052) arises from improper isolation of local workflow version history backups in multi-tenant HTTP mode (ENABLE_MULTI_TENANT=true). Authenticated tenants can bypass authorization controls to access and modify backups belonging to other tenants. This leads to unauthorized disclosure and modification of sensitive workflow data, including credentials and authorization headers. The flaw is addressed in n8n-mcp version 2.56.1.
Potential Impact
An authenticated tenant can read and delete workflow version backups of other tenants, exposing sensitive information such as full node definitions, credential references, and authorization headers. This compromises confidentiality, integrity, and availability of tenant data within the multi-tenant environment.
Mitigation Recommendations
Upgrade n8n-mcp to version 2.56.1 or later, where this authorization bypass vulnerability is fixed. No other mitigations are specified. Patch status is confirmed by the vendor advisory stating the issue is fixed in 2.56.1.
CVE-2026-54052: CWE-639: Authorization Bypass Through User-Controlled Key in czlonkowski n8n-mcp
Description
n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.56.1, in HTTP mode with multi-tenancy enabled through ENABLE_MULTI_TENANT=true, n8n-mcp's local workflow version history backups were not isolated per tenant, allowing an authenticated tenant to read workflow version snapshots belonging to other tenants and delete or destroy other tenants' stored backups, including full node definitions, credential references, and authorization headers. This issue is fixed in version 2.56.1.
CVSS v3.1
Score 9.9critical
Affected software
pkg:github/czlonkowski/n8n-mcpRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in n8n-mcp (CVE-2026-54052) arises from improper isolation of local workflow version history backups in multi-tenant HTTP mode (ENABLE_MULTI_TENANT=true). Authenticated tenants can bypass authorization controls to access and modify backups belonging to other tenants. This leads to unauthorized disclosure and modification of sensitive workflow data, including credentials and authorization headers. The flaw is addressed in n8n-mcp version 2.56.1.
Potential Impact
An authenticated tenant can read and delete workflow version backups of other tenants, exposing sensitive information such as full node definitions, credential references, and authorization headers. This compromises confidentiality, integrity, and availability of tenant data within the multi-tenant environment.
Mitigation Recommendations
Upgrade n8n-mcp to version 2.56.1 or later, where this authorization bypass vulnerability is fixed. No other mitigations are specified. Patch status is confirmed by the vendor advisory stating the issue is fixed in 2.56.1.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-11T18:24:35.096Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a57f59668715ace437838d8
Added to database: 07/15/2026, 21:03:18 UTC
Last enriched: 07/22/2026, 22:48:16 UTC
Last updated: 08/29/2026, 10:52:09 UTC
Views: 219
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